Quick Answer: What Are The Factors Affecting The Growth Of Bacteria?

What chemical can kill bacteria?

Chemical DisinfectantsAlcohol.Chlorine and chlorine compounds.Formaldehyde.Glutaraldehyde.Hydrogen peroxide.Iodophors.Ortho-phthalaldehyde (OPA)Peracetic acid.More items….

How does pH affect growth of microorganisms?

Microbes, such as bacteria are sensitive to the hydrogen ion concentration they find in their environment. Large proteins, such as enzymes, are affected by pH. Their shape changes (they denature) and the very often brings about an alteration of the ionic charges on the molecule.

How can you prevent the growth of microorganisms in food?

To keep foods safe, remember to keep foods out of the Temperature Danger Zone, and if your food sits out, make a habit of getting your cold food in the refrigerator within two hours. Your hot food should be cooled quickly and put away in that timeframe as well.

What are the sources of microorganisms?

Microorganisms, including bacteria, viruses and parasites, can come from the following sources:improperly treated sewage,runoff from animal wastes,industrial sources such as slaughter houses, food and paper processing plants,and some landfills.

How do you kill bacteria in your body?

Here are his five tips:Eat pre-biotic foods. Healthy gut bacteria thrive on pre-biotics, which are non-digestible fibers found in foods like root vegetables, onions, leeks, garlic, artichokes, beans, asparagus, oats, nuts, and bananas. … Drink Green Juice. … Cut out processed foods. … Limit antibiotics. … Get your probiotics.

How do bacteria grow?

Bacteria do not grow and multiply the same way as animals or humans. They take in nutrients and reproduce by dividing – one bacteria splits and becomes two bacteria, two become four, four become eight and so on. Doubling can occur quickly if the conditions – enough nutrients, proper temperature, adequate moisture, etc.

Which factors are required for growth?

Growth factors are organic compounds such as amino acids , purines , pyrimidines , and vitamins that a cell must have for growth but cannot synthesize itself. Organisms having complex nutritional requirements and needing many growth factors are said to be fastidious .

What are the six factors that affect the growth of bacteria?

Factor affecting bacterial growthNutrition concentration.Temperature.Gaseous concentration.pH.Ions and salt concentration.Available water.

Does acidity affect the growth of bacteria in food?

The acidity of a food is also important for bacterial growth. … Foods with a pH close to 7.0 are ideal for most bacterial growth. Every microorganism has a minimum, optimum and maximum pH for growth. The optimum growth range is about 6.0 to 7.5, but growth can occur slowly at lower or higher pH levels.

What are two ways of killing bacteria?

How to kill Bacteria?How to kill Bacteria? … The process of killing bacteria and other micro-organisms either in a vegetative or a spore state is known as sterilization. … Sterilization or bacterial killing is brought about by many methods, such as physical methods, irradiation and chemical agents or disinfectants.More items…•

At what temperature do bacteria stop growing?

Between 0°C and 4°C (or 32°F and 40°F), most bacteria will survive but will not multiply quickly. Water freezes at 0°C (or 32°F). Between 0°C and −18°C (or 0°F and 32°F), most bacterial will survive but not grow.

What temp kills bacteria?

Bacteria multiply rapidly between 40 and 140 degrees. Bacteria will not multiply but may start to die between 140 and 165 degrees. Bacteria will die at temperatures above 212 degrees. 2.3: How to Take Food Temperatures Know how to get an accurate reading with your thermometer!

What factors affect the growth of an organism?

Factors That Affect the Growth of MicroorganismsNutrients. All microorganisms need food. … Temperature. In general, the higher the temperature, the more easily microorganisms can grow up to a certain point. … pH Levels. … Moisture. … Elements Present.

How does temperature affect growth of bacteria?

Physical Factors that Control Microbial Growth. Generally,an increase in temperature will increase enzyme activity. But if temperatures get too high, enzyme activity will diminish and the protein (the enzyme) will denature. On the other hand, lowering temperature will decrease enzyme activity.

Do bacteria require oxygen to grow?

Oxygen. … Whereas essentially all eukaryotic organisms require oxygen to thrive, many species of bacteria can grow under anaerobic conditions. Bacteria that require oxygen to grow are called obligate aerobic bacteria.

What is the best temperature for bacteria to grow?

The optimum temperature range for bacterial growth is between 5-63℃….This is known as the danger zone as it is dangerous for some foods to be in this temperature range for prolonged periods of time.Moisture – Bacteria need moisture in order to grow. … Food – Food provides energy and nutrients for bacteria to grow.More items…

How do genetic factors influence growth?

Normal physical growth during childhood is influenced by both genetic and environmental factors. … Results of the genetic correlation analysis reveal some evidence of common genetic pathways underlying certain aspects of growth and adult health outcomes including body composition and blood pressure variables.

What are the 4 main growth requirements for bacteria?

What bacteria need to grow and multiplyFood (nutrients)Water (moisture)Proper temperature.Time.Air, no air, minimal air.Proper acidity (pH)Salt levels.

What factors affect the growth of bacteria in general?

Warmth, moisture, pH levels and oxygen levels are the four big physical and chemical factors affecting microbial growth.

What are the factors that affect the growth of bacteria in food?

Most foods contain sufficient nutrients to support microbial growth. Several factors encourage, prevent, or limit the growth of microorganisms in foods, the most important are aw, pH, and temperature. aw: (Water Activity or Water Availability).

What inhibits the growth of bacteria?

Control of growth usually involves the use of physical or chemical agents which either kill or prevent the growth of microorganisms. Agents which kill cells are called cidal agents; agents which inhibit the growth of cells (without killing them) are referred to as static agents.